More than 582,000 musculoskeletal disorders requiring recuperation away from work were reported by employers in 1999, according to the Bureau of Labor Statistics. That number has dropped since 1992, but MSDs still account for more than one-third of all lost-time cases, according to BLS.

Here’s who gets hit with lost-time ergo cases most often:

Nursing aides, orderlies, and attendants — 44,300 cases

Truck drivers — 41,700 Laborers, nonconstruction — 32,800

Assemblers — 17,900

Janitors and cleaners — 14,100

Registered nurses — 13,100

Stock handlers and baggers — 12,400

Construction laborers — 11,000

Cashiers — 9,700

Sales supervisors and proprietors — 9,300